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焦化废水是一种难以处理的工业废水。国内外自六十年代末对焦化废水进行了许多研究工作,普遍采用常规生物处理法,对控制出水的酚、氰含量有较好的效果,但对氨氮和难降解的有机物的去除很不理想。 1988年国家环保局批准发布的《污水综合排放标准》(BG8978—88)中,明确规定氨氮的最高允许排放浓度为15、25及40mg/L三个等级,国内的焦化厂外排废水的氨氮一般都在200～400mg/L,焦化废水处理出水超标的问题十分严重。
Coking wastewater is a difficult to deal with industrial wastewater. At home and abroad, many research work has been done on coking wastewater since the late 1960s. Conventional biological treatment methods are generally used to control phenol and cyanide effluent levels. However, the removal of ammonia nitrogen and refractory organic compounds is not satisfactory . In 1988, the “Integrated Wastewater Discharge Standard” (BG8978-88) issued by the State Environmental Protection Administration clearly stipulated that the maximum allowable emission concentration of ammonia nitrogen should be 15, 25 and 40mg / L. The ammonia nitrogen Generally in the 200 ~ 400mg / L, coking wastewater effluent exceeding the standard problem is very serious.